Xiaoyang Xia, Muhammad Riaz, Saba Babar, Yuxuan Li, Xiangling Wang, Jiyuan Wang, Cuncang Jiang
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引用次数: 0
Abstract
Purpose
Soil salinization severely hinders the development of agriculture. Pristine biochar (BC) has a considerable impact on improving soil quality and maximizing crop yield. However, applying biochar has the risk of aggravating soil salinization. Acid-modified biochar may have a good effect on the improvement of saline-alkali soil.
Methods
Nitric acid and phosphoric acid were used to modify the pristine biochar (BC). The pristine biochar (BC), nitric acid-modified biochar (NC) and phosphoric acid-modified biochar (PC) were used at 1%, 2%, and 3% (w/w), respectively. There were ten treatments in total: CK, BC1, BC2, BC3, NC1, NC2, NC3, PC1, PC2, and PC3.
Results
Our results indicated that the application of biochar further aggravated soil salinization. Soil pH and EC significantly increased by 0.08–0.42 units and 215.51–362.07 μS.cm−1, respectively. Additionally, the BC application reduced the activities of C-, N- and P-acquiring enzymes in saline-alkali soil. Compared with BC, NC and PC decreased the alkaline metal elements by 84.34% and 79.29%, respectively, and enhanced the specific surface area. Acid-modified biochar significantly reduced the content of Na+, Cl−, SO42−, CO32− and HCO3−. Meanwhile, the application of acid-modified biochar reduced soil pH and EC by 0.16–0.59 units, 228.38–788.93 μS.cm−1, respectively. Furthermore, the application of acid-modified biochar enhanced N fixation ability and the activity of C-acquiring enzymes and P-acquiring enzymes.
Conclusions
The application of pristine cotton straw biochar will further aggravate soil salinization, thereby inhibiting the soil enzyme activities. In contrast, acid-modified cotton straw biochar can reduce soil salinity, improve soil available nutrients and also enhance the enzymatic activities, which is advantageous to the restoration of saline-alkali soil.
期刊介绍:
The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.